chrono.hpp

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#pragma once
#include <chrono>
#include <ratio>

#define __GCC_VERSION__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
#if __cplusplus <= 201703L || (_MSC_VER && _MSC_VER < 1929) || (!__clang__ && !_MSC_VER && __GCC_VERSION__ < 100000)
namespace std {
  namespace chrono {
    using days = std::chrono::duration<long, std::ratio<86400>>;
    using weeks = std::chrono::duration<long, std::ratio<604800>>;
    using months = std::chrono::duration<long, std::ratio<2629746>>;
    using years = std::chrono::duration<long, std::ratio<31556952>>;
  }
}
#endif